extend output of --list-keywords

docs/configuration.rst

@@ -266,7 +266,7 @@ Description Select the directory structure created by the Gallery- and
 
             * ``true``: Use a flat directory structure.
             * ``false``: Collect a list of all gallery-folders or
-              favorites-collections and defere any further work to other
+              favorites-collections and transfer any further work to other
               extractors (``folder`` or ``collection``), which will then
               create individual subdirectories for each of them.
 =========== =====

gallery_dl/job.py

@@ -163,6 +163,12 @@ class KeywordJob(Job):
         print("-----------------------------")
         self.print_keywords(keywords)
 
+    def handle_queue(self, url):
+        print("This extractor transfers work to other extractors and does not "
+              "provide any keywords on its own. Try "
+              "'gallery-dl --list-keywords \"", url, "\"' instead.", sep="")
+        raise exception.StopExtraction()
+
     @staticmethod
     def print_keywords(keywords, prefix=""):
         """Print key-value pairs with formatting"""